说明：  详细介绍了利用PADS 9.5 实现原理图与PCB设计的方法和技巧。配合大量示意图，介绍了印制电路板设计流程和常用电路模块的PCB处理方法
(The method and technique of using PADS 9.5 to realize schematic diagram and PCB design are introduced in detail. With a large number of schematic diagrams, the design process of printed circuit boards and the PCB processing methods of common circuit modules are introduced)